Iwo metal spheres in contact are suspended by cotton threads. Q is grounded. A positively charged rod is then held close to P, what would be the charge on each sphere? PQ + + + + + O P: negative; Q: positive O P: no charge; Q: no charge O P: positive; Q: no charge P: negative; Q: negative O P: negative; Q: no charge P: positive; Q: positive

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